[Vwdiesel] '81 Rabbit questions

James Hansen jhsg at sasktel.net
Mon Dec 17 18:43:22 PST 2007

I have never had real what you could call "heat" from a VW diesel.
If the cooling system is good, and engine in a good state of tune, the 
heater core is sufficient below -20 to keep the motor cool, regardless 
of load. This is on everything from 82 Jetta 1.6 to 89 td, to 99 jetta 
tdi, 97 Passat tdi...

They don't make enough heat to overpower the cold air moving through the 
heater core... that's when it's really cold, and all of the rad core 
except the top 2" is covered with cardboard tight to the core.
Pull in off the highway, with the motor at normal operating temp, and 
heater at full, the temp gauge drops like a stone.  Reminds me of 
driving an aircooled, slow down, the heat more or less stops.  It's 
freaky.  The large volume of unthrottled air passing through the engine 
can't help either...

mikitka wrote:
> My 91 ECO jetta pumps out heat in as little as 2 miles down the road, by the
> time I hit 3 it is running at normal temps. The heat coming from the heater
> I relate to the coolant running straight from the head to the heater core,
> but then I could be wrong but it makes sense. All I know is it gets nice and
> toasty quick and I don't mind one bit. :)
> Nick
>   I've had two different Rabbits come to me that had 107-A 
> pumps and were timed to .88mm.  Ran really sluggy.  Never 
> had one run hot from timing issues but then I alway set the 
> timing right!  Did drive ONE, an '81 that was cranking out 
> good heat in just a few blocks.  I was leary that it had a 
> blown head gasket and price was a little too high anyway.
> This was long ago before I achieved Guru status.  ;-D
>      Loren
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